add option for deformable rigid split impulse

src/BulletDynamics/Dynamics/btRigidBody.h

@@ -332,6 +332,48 @@ public:
 			}
 		}
 	}
+    
+    void applyPushImpulse(const btVector3& impulse, const btVector3& rel_pos)
+    {
+        if (m_inverseMass != btScalar(0.))
+        {
+            applyCentralPushImpulse(impulse);
+            if (m_angularFactor)
+            {
+                applyTorqueTurnImpulse(rel_pos.cross(impulse * m_linearFactor));
+            }
+        }
+    }
+    
+    btVector3 getPushVelocity()
+    {
+        return m_pushVelocity;
+    }
+    
+    btVector3 getTurnVelocity()
+    {
+        return m_turnVelocity;
+    }
+    
+    void setPushVelocity(const btVector3& v)
+    {
+        m_pushVelocity = v;
+    }
+    
+    void setTurnVelocity(const btVector3& v)
+    {
+        m_turnVelocity = v;
+    }
+    
+    void applyCentralPushImpulse(const btVector3& impulse)
+    {
+        m_pushVelocity += impulse * m_linearFactor * m_inverseMass;
+    }
+    
+    void applyTorqueTurnImpulse(const btVector3& torque)
+    {
+        m_turnVelocity += m_invInertiaTensorWorld * torque * m_angularFactor;
+    }
 
 	void clearForces()
 	{